Prebiotic Foods in Australia: What They Are and Where to Find Them

Prebiotics are fibres and plant compounds that your body can't digest but your gut bacteria can. They pass through to the large intestine and feed the beneficial bacteria living there. Unlike probiotics (which are the bacteria themselves), prebiotics are the food supply. The best-known ones are fructans (including inulin), beta-glucan, and arabinoxylan, and they're found in ordinary foods you can buy in any Australian supermarket.

What makes a food prebiotic?

A fibre counts as prebiotic when it survives digestion intact and is fermented by beneficial gut bacteria in the large intestine. Not all fibre qualifies: some fibre types pass through largely unfermented, which is useful for other reasons but doesn't feed the microbiome the same way. Foods aren't "prebiotic or not" so much as they contain more or less prebiotic fibre.

The prebiotic foods easiest to find in Australia

• Onion, garlic, and leek. Rich in fructans. Cooked or raw, they're the workhorses, and they're already in most savoury cooking.
• Asparagus and Jerusalem artichokes. Both high in inulin. Seasonal but widely stocked.
• Legumes. Chickpeas, lentils, and beans carry fructans and resistant starch along with their fibre.
• Slightly under-ripe bananas. Greener bananas carry more resistant starch, which behaves prebiotically.
• Oats and barley. Good sources of beta-glucan.
• Rye and rye bran. Rye carries all three of the major prebiotic fibres, fructans, beta-glucan, and arabinoxylan, with the concentration highest in the bran layer.
• Wheat bran. A strong source of arabinoxylan.

How much do you need?

There's no official Australian prebiotic target. The practical approach is variety and regularity: small amounts of several prebiotic foods most days beats a large amount of one food occasionally. If you're covering your overall fibre target (25g for women, 30g for men) with a mix of the foods above, prebiotic intake generally takes care of itself.

Where rye bran sits

Rye bran is unusual because the three major prebiotic fibres occur together in it naturally: fructans, beta-glucan, and arabinoxylan. No other single wholefood contains all three.

Processing matters here, and it's the part most labels don't mention. Most commercial bran is a by-product of flour milling, heat-processed for milling efficiency and shelf life, and heat damages the delicate fibre structures the grain grew with. Ryedical is cold-processed under 45°C specifically so those prebiotic fibres survive intact, from the grain to your bowl. That's the point of buying rye bran for its prebiotics: making sure they're still there when you eat it†.

One honest caution: prebiotic fibres, particularly fructans, are FODMAPs. They're the same compounds that feed beneficial bacteria, which is why a low-FODMAP diet and a prebiotic-rich diet pull in opposite directions. If you have IBS or follow a low-FODMAP diet, introduce prebiotic foods slowly and talk to your healthcare professional. Rye bran also contains gluten and is not suitable for people with coeliac disease or non-coeliac gluten sensitivity.

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Related reading

• How to increase your fibre intake
• Soluble vs insoluble fibre: what the difference actually means
• The science behind C17 alkylresorcinols

†As part of a balanced diet.

This article is general information and does not provide medical advice. Speak with your healthcare professional about your specific dietary needs.